Thin-Walled Structures最新文献

Enhancing the thermal distribution homogenization and interfacial adhesion at induction welded composite interface by SCF reinforced thermoplastic layer SCF增强热塑性层增强感应焊复合材料界面的热分布均匀性和界面附着力

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-29 DOI: 10.1016/j.tws.2026.114593

Xueyan Zhang , Ziwei Feng , Jianhui Su , Xiaohui Han , Guolong Ma , Fuyun Liu , Bo Chen , Xiaoguo Song , Caiwang Tan

Induction welding of carbon fiber reinforced thermoplastic (CFRTP) often faces edge effect issue, which negatively affects the joint quality. This study explored the induction welding of carbon fiber reinforced polyamide 66 (CF/PA66) using a composite PA66 film reinforced with short carbon fiber (SCF) at interface to reduce edge effect and improve joint strength. Results indicated that the incorporation of SCF increased the number of polar functional groups on the resin film and increased surface roughness, promoting adhesion force between heating element (HE) and matrix. Additionally, the randomly dispersed SCFs formed interconnected heat-conduction pathways within the PA66 matrix, which enhanced the thermal conductivity of the interface by providing additional heat transfer routes alongside the HE. Finite element analysis (FEA) confirmed that the improved heat transfer capability at interface contributed to a more uniform temperature distribution. Furthermore, the PA66 films prepared with SCF exhibited a lower thermal expansion coefficient, which enhanced thermal shrinkage resistance and minimized stress concentration. Finally, the integration of SCF markedly enhanced lap shear strength (LSS) of joints, achieving an increase of 1.37 times compared to the strength of joints without SCF under optimal heat input conditions. This improvement presented a novel strategy for attaining high-quality induction-welded joints.

碳纤维增强热塑性塑料（CFRTP）的感应焊接常面临边缘效应问题，对接头质量产生不利影响。本研究探讨了在界面处使用短碳纤维增强PA66复合膜（SCF）进行碳纤维增强聚酰胺66 （CF/PA66）的感应焊接，以减小边缘效应，提高接头强度。结果表明，SCF的加入增加了树脂膜上极性官能团的数量，提高了表面粗糙度，增强了加热元件与基体之间的附着力。此外，随机分散的scf在PA66基质内形成了相互连接的导热路径，通过在HE旁边提供额外的传热路径，增强了界面的导热性。有限元分析证实，界面传热能力的提高使得温度分布更加均匀。此外，SCF制备的PA66薄膜具有较低的热膨胀系数，增强了热收缩性能，减小了应力集中。最后，在最优热输入条件下，SCF的集成显著提高了节点的搭接抗剪强度（LSS），与不含SCF的节点相比，LSS的强度提高了1.37倍。这种改进为获得高质量的感应焊接接头提供了一种新的策略。

{"title":"Enhancing the thermal distribution homogenization and interfacial adhesion at induction welded composite interface by SCF reinforced thermoplastic layer","authors":"Xueyan Zhang , Ziwei Feng , Jianhui Su , Xiaohui Han , Guolong Ma , Fuyun Liu , Bo Chen , Xiaoguo Song , Caiwang Tan","doi":"10.1016/j.tws.2026.114593","DOIUrl":"10.1016/j.tws.2026.114593","url":null,"abstract":"<div><div>Induction welding of carbon fiber reinforced thermoplastic (CFRTP) often faces edge effect issue, which negatively affects the joint quality. This study explored the induction welding of carbon fiber reinforced polyamide 66 (CF/PA66) using a composite PA66 film reinforced with short carbon fiber (SCF) at interface to reduce edge effect and improve joint strength. Results indicated that the incorporation of SCF increased the number of polar functional groups on the resin film and increased surface roughness, promoting adhesion force between heating element (HE) and matrix. Additionally, the randomly dispersed SCFs formed interconnected heat-conduction pathways within the PA66 matrix, which enhanced the thermal conductivity of the interface by providing additional heat transfer routes alongside the HE. Finite element analysis (FEA) confirmed that the improved heat transfer capability at interface contributed to a more uniform temperature distribution. Furthermore, the PA66 films prepared with SCF exhibited a lower thermal expansion coefficient, which enhanced thermal shrinkage resistance and minimized stress concentration. Finally, the integration of SCF markedly enhanced lap shear strength (LSS) of joints, achieving an increase of 1.37 times compared to the strength of joints without SCF under optimal heat input conditions. This improvement presented a novel strategy for attaining high-quality induction-welded joints.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"223 ","pages":"Article 114593"},"PeriodicalIF":6.6,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-objective optimization of FG-TPMS plates based on isogeometric analysis 基于等几何分析的FG-TPMS板的多目标优化

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-28 DOI: 10.1016/j.tws.2026.114591

Chenxu Chu , Chao Wang , Yun Chong , Xiaolu Wang

This paper proposes a novel methodology for the optimizing the material distribution of functionally graded triply periodic minimal surface (FG-TPMS) plates. The approach integrates isogeometric analysis (IGA) with simple first-order shear deformation theory (S-FSDT) to accurately capture the mechanical behavior of FG-TPMS plates. A recently proposed adaptive multi-objective chaotic particle swarm optimization (MOACPSO) algorithm is employed to solve minimization problems with mixed constraints. This algorithm effectively enhances the balance between the local and global search abilities, consequently improving the accuracy and convergence speed of the solution. The material distribution is parametrically defined utilizing B-spline basis functions, with thickness direction control points serving as the design variables. The optimization objectives are established as maximizing the first natural frequency and the minimizing structural weight. Numerical examples of square, circle, quarter of a circular and snowflake plates illustrate the optimized material distributions of representative elite solutions and corresponding first form modes. These results collectively validate the feasibility of the proposed method for optimizing the material distribution of FG-TPMS plates.

本文提出了一种优化功能梯度三周期最小表面（FG-TPMS）板材料分布的新方法。该方法将等几何分析（IGA）与简单一阶剪切变形理论（S-FSDT）相结合，可以准确捕捉FG-TPMS板的力学行为。采用自适应多目标混沌粒子群算法（MOACPSO）求解混合约束下的最小化问题。该算法有效地增强了局部和全局搜索能力的平衡，从而提高了解的精度和收敛速度。材料分布采用b样条基函数进行参数化定义，厚度方向控制点作为设计变量。将优化目标确定为第一固有频率最大化和结构重量最小化。方形板、圆形板、四分之一圆板和雪花板的数值算例说明了具有代表性的精英解和相应的一阶模态的优化材料分布。这些结果共同验证了该方法优化FG-TPMS板材料分布的可行性。

{"title":"Multi-objective optimization of FG-TPMS plates based on isogeometric analysis","authors":"Chenxu Chu , Chao Wang , Yun Chong , Xiaolu Wang","doi":"10.1016/j.tws.2026.114591","DOIUrl":"10.1016/j.tws.2026.114591","url":null,"abstract":"<div><div>This paper proposes a novel methodology for the optimizing the material distribution of functionally graded triply periodic minimal surface (FG-TPMS) plates. The approach integrates isogeometric analysis (IGA) with simple first-order shear deformation theory (S-FSDT) to accurately capture the mechanical behavior of FG-TPMS plates. A recently proposed adaptive multi-objective chaotic particle swarm optimization (MOACPSO) algorithm is employed to solve minimization problems with mixed constraints. This algorithm effectively enhances the balance between the local and global search abilities, consequently improving the accuracy and convergence speed of the solution. The material distribution is parametrically defined utilizing B-spline basis functions, with thickness direction control points serving as the design variables. The optimization objectives are established as maximizing the first natural frequency and the minimizing structural weight. Numerical examples of square, circle, quarter of a circular and snowflake plates illustrate the optimized material distributions of representative elite solutions and corresponding first form modes. These results collectively validate the feasibility of the proposed method for optimizing the material distribution of FG-TPMS plates.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"223 ","pages":"Article 114591"},"PeriodicalIF":6.6,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and numerical investigation on seismic performance enhancement of free-spanning submarine pipelines equipped with casing-pipe type TMD 套管式TMD增强海底自由跨管道抗震性能的试验与数值研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.tws.2026.114588

Haiyang Pan , Chao Li , Jiahui Hu , Hong-Nan Li , Guoan Wang

Although the seismic design of free-spanning submarine pipelines (FSSPs) can enable structures to remain life safety during severe offshore earthquakes by permitting non-failure inelastic deformation, the resulting structural damage typically entails prohibitively high repair costs. With this background, a novel casing-pipe type TMD (CP-TMD) consisting of a uniformly mass-distributed casing-pipe and multiple spring-dashpot elements is implemented to enhance the seismic performance of FSSPs, thereby ensuring structural safety. Firstly, multiple underwater shaking table tests were carried out on a scale FSSP model, deploying the CP-TMD under examination. Test results highlighted the excellent energy dissipation performance of the vibration control device during the vibration process of the FSSP. Secondly, numerical simulations incorporating the added hydrodynamic mass method are carried out to explore the influence of the design parameters (casing-pipe length and installation scenario) of CP-TMD on the control effect for stochastic seismic responses of the FSSP. Finally, seismic fragility curves of the FSSP equipped with CP-TMD featuring optimal design parameters are developed. Moreover, the effectiveness of CP-TMD for improving the seismic performance of the FSSP is further estimated by comparing seismic fragilities with and without the vibration control device. The analysis results indicate the proposed CP-TMD can significantly mitigate the seismic responses of the FSSP, and the FSSP equipped with CP-TMD exhibit much lower damage probability under same seismic intensities. This investigation could provide meaningful references for the development of vibration control strategies for enhancing seismic resilience of FSSPs.

尽管自由跨越海底管道（fssp）的抗震设计可以通过允许非弹性变形而使结构在严重的海上地震中保持生命安全，但由此导致的结构损坏通常需要高昂的修复成本。在此背景下，提出了一种由均匀质量分布的套管和多个弹簧减震器单元组成的新型套管型TMD (CP-TMD)，以提高fssp的抗震性能，从而确保结构安全。首先，在一个比例FSSP模型上进行了多次水下振动台试验，部署了CP-TMD。试验结果表明，该振动控制装置在FSSP振动过程中具有良好的消能性能。其次，采用附加水动力质量法进行数值模拟，探讨了CP-TMD的设计参数（套管长度和安装场景）对FSSP随机地震响应控制效果的影响。最后，建立了具有最优设计参数的CP-TMD框架结构的地震易损性曲线。此外，通过比较有无振动控制装置的地震易损性，进一步估计了CP-TMD对提高FSSP抗震性能的有效性。分析结果表明，CP-TMD能显著减轻FSSP的地震反应，在相同烈度下，安装CP-TMD的FSSP的损伤概率明显降低。研究结果可为提高结构抗震能力的振动控制策略的制定提供有意义的参考。

{"title":"Experimental and numerical investigation on seismic performance enhancement of free-spanning submarine pipelines equipped with casing-pipe type TMD","authors":"Haiyang Pan , Chao Li , Jiahui Hu , Hong-Nan Li , Guoan Wang","doi":"10.1016/j.tws.2026.114588","DOIUrl":"10.1016/j.tws.2026.114588","url":null,"abstract":"<div><div>Although the seismic design of free-spanning submarine pipelines (FSSPs) can enable structures to remain life safety during severe offshore earthquakes by permitting non-failure inelastic deformation, the resulting structural damage typically entails prohibitively high repair costs. With this background, a novel casing-pipe type TMD (CP-TMD) consisting of a uniformly mass-distributed casing-pipe and multiple spring-dashpot elements is implemented to enhance the seismic performance of FSSPs, thereby ensuring structural safety. Firstly, multiple underwater shaking table tests were carried out on a scale FSSP model, deploying the CP-TMD under examination. Test results highlighted the excellent energy dissipation performance of the vibration control device during the vibration process of the FSSP. Secondly, numerical simulations incorporating the added hydrodynamic mass method are carried out to explore the influence of the design parameters (casing-pipe length and installation scenario) of CP-TMD on the control effect for stochastic seismic responses of the FSSP. Finally, seismic fragility curves of the FSSP equipped with CP-TMD featuring optimal design parameters are developed. Moreover, the effectiveness of CP-TMD for improving the seismic performance of the FSSP is further estimated by comparing seismic fragilities with and without the vibration control device. The analysis results indicate the proposed CP-TMD can significantly mitigate the seismic responses of the FSSP, and the FSSP equipped with CP-TMD exhibit much lower damage probability under same seismic intensities. This investigation could provide meaningful references for the development of vibration control strategies for enhancing seismic resilience of FSSPs.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"223 ","pages":"Article 114588"},"PeriodicalIF":6.6,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cascading deep neural networks for inverse design of acoustic-mechanical multifunctional metastructures 基于级联深度神经网络的声-力多功能元结构反设计

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.tws.2026.114587

Penghui Zhu , Chen Du , Jiajun Chen , He Liao , Xiaosu Yi , Wenming Zhao , Xiongqi Peng

Multifunctional, lightweight, and compact structures have become increasingly essential in modern applications, as exemplified by airplanes. This paper presents a methodology for the concurrent inverse design of acoustic-mechanical properties in curved-crease origami foldcore sandwich structures, utilizing deep neural networks. Initially, a forward neural network was developed to predict sound absorption coefficients, buckling strength, and failure strength based on geometric parameters. Subsequently, an inverse neural network was constructed and cascaded with the pretrained forward neural network to achieve inverse design, mapping functional requirements to geometric characteristics. Through two practical engineering cases and experimental validations, one of the inverse-designed structures with a thickness of 21.4 mm exhibits excellent sound absorption (α > 0.85) at the target frequencies of 720 Hz and 900 Hz. Another inverse-designed structure, with a thickness of 22.4 mm, achieves 75% sound absorption within the target frequency band (600–1000 Hz). Furthermore, the inverse-designed structures exhibit exceptional mechanical performance, with failure strength exceeding 60 MPa and specific strength reaching up to 32.3 MPa/g. This work accomplishes the inverse design of a metastructure characterized by lightweight, ultra-thin, and functionality-customizable attributes, highlighting its potential applications in aerospace, transportation, and architectural acoustics engineering.

多功能、轻量化和紧凑的结构在现代应用中变得越来越重要，飞机就是一个例子。提出了一种基于深度神经网络的弯曲折纸芯夹层结构声力学性能并行反设计方法。首先，开发了一种基于几何参数的前向神经网络来预测吸声系数、屈曲强度和破坏强度。随后，构建逆神经网络，并与预训练的正向神经网络级联，实现逆设计，将功能需求映射到几何特征。通过两个工程实例和实验验证，其中厚度为21.4 mm的反设计结构在720 Hz和900 Hz目标频率下具有良好的吸声性能（α > 0.85）。另一种反设计结构，厚度为22.4 mm，在目标频带（600-1000 Hz）内实现75%的吸声。反设计结构的破坏强度超过60 MPa，比强度达到32.3 MPa/g，力学性能优异。这项工作完成了一种以轻量化、超薄和功能可定制属性为特征的元结构的逆设计，突出了其在航空航天、交通运输和建筑声学工程中的潜在应用。

{"title":"Cascading deep neural networks for inverse design of acoustic-mechanical multifunctional metastructures","authors":"Penghui Zhu , Chen Du , Jiajun Chen , He Liao , Xiaosu Yi , Wenming Zhao , Xiongqi Peng","doi":"10.1016/j.tws.2026.114587","DOIUrl":"10.1016/j.tws.2026.114587","url":null,"abstract":"<div><div>Multifunctional, lightweight, and compact structures have become increasingly essential in modern applications, as exemplified by airplanes. This paper presents a methodology for the concurrent inverse design of acoustic-mechanical properties in curved-crease origami foldcore sandwich structures, utilizing deep neural networks. Initially, a forward neural network was developed to predict sound absorption coefficients, buckling strength, and failure strength based on geometric parameters. Subsequently, an inverse neural network was constructed and cascaded with the pretrained forward neural network to achieve inverse design, mapping functional requirements to geometric characteristics. Through two practical engineering cases and experimental validations, one of the inverse-designed structures with a thickness of 21.4 mm exhibits excellent sound absorption (α > 0.85) at the target frequencies of 720 Hz and 900 Hz. Another inverse-designed structure, with a thickness of 22.4 mm, achieves 75% sound absorption within the target frequency band (600–1000 Hz). Furthermore, the inverse-designed structures exhibit exceptional mechanical performance, with failure strength exceeding 60 MPa and specific strength reaching up to 32.3 MPa/g. This work accomplishes the inverse design of a metastructure characterized by lightweight, ultra-thin, and functionality-customizable attributes, highlighting its potential applications in aerospace, transportation, and architectural acoustics engineering.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"223 ","pages":"Article 114587"},"PeriodicalIF":6.6,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing impact resistance by customizable hybrid lattice structures with anisotropy 通过具有各向异性的可定制混合晶格结构增强抗冲击性

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.tws.2026.114585

Jing Wei , Zhiqiang Liu , Yuxing Zhou , Qinqin Wei , Shengchao Chen , Guoqiang Luo , Qiang Shen

Lattice structures with excellent mechanical properties have attracted considerable attention for use in various applications, especially for energy absorption. However, their application is limited by their brittle fracture due to stress concentration and poor impact resistance. In this paper, we propose a novel hybrid lattice structure for exceptional impact resistance derived from the framework of pixelated body-centered-cubic (BCC) structure. The multi-cell hybrid lattice structure alleviates stress concentration, and suppresses shear band formation by customizing stress transfer path, thereby impeding crack propagation. Applying this structure, we develop the multi-cell hybrid lattice structure that achieves superior impact resistance of the conventional structures. Quasi-static compression and the Split Pressure Hopkinson Bar (SHPB) testing were conducted. Finite element analysis (FEA) was employed to investigate the anisotropy of lattice structures under uniaxial compression, shear, and hydrostatic loading, providing further insight into the mechanisms behind the performance improvements of the hybrid lattice structure. By leveraging hybrid lattice structure to coordinate dynamic deformation, this work establishes a generalizable framework for designing high-performance, impact resistant materials for aerospace engineering, automobile design, and packaging.

晶格结构具有优异的力学性能，在各种应用中，特别是在能量吸收方面受到了广泛的关注。然而，由于应力集中和抗冲击性差，它们的脆性断裂限制了它们的应用。在本文中，我们提出了一种基于像素化体心立方（BCC）结构框架的新型混合晶格结构，具有优异的抗冲击性。多胞杂化晶格结构减轻了应力集中，并通过定制应力传递路径抑制剪切带的形成，从而阻碍裂纹扩展。利用这种结构，我们开发了多胞混合晶格结构，该结构具有比传统结构更好的抗冲击性能。进行了准静态压缩和分压霍普金森杆（SHPB）试验。采用有限元分析（FEA）研究了混合晶格结构在单轴压缩、剪切和静水载荷作用下的各向异性，进一步揭示了混合晶格结构性能改善的机制。通过利用混合晶格结构来协调动态变形，这项工作为设计用于航空航天工程、汽车设计和包装的高性能、抗冲击材料建立了一个可推广的框架。

{"title":"Enhancing impact resistance by customizable hybrid lattice structures with anisotropy","authors":"Jing Wei , Zhiqiang Liu , Yuxing Zhou , Qinqin Wei , Shengchao Chen , Guoqiang Luo , Qiang Shen","doi":"10.1016/j.tws.2026.114585","DOIUrl":"10.1016/j.tws.2026.114585","url":null,"abstract":"<div><div>Lattice structures with excellent mechanical properties have attracted considerable attention for use in various applications, especially for energy absorption. However, their application is limited by their brittle fracture due to stress concentration and poor impact resistance. In this paper, we propose a novel hybrid lattice structure for exceptional impact resistance derived from the framework of pixelated body-centered-cubic (BCC) structure. The multi-cell hybrid lattice structure alleviates stress concentration, and suppresses shear band formation by customizing stress transfer path, thereby impeding crack propagation. Applying this structure, we develop the multi-cell hybrid lattice structure that achieves superior impact resistance of the conventional structures. Quasi-static compression and the Split Pressure Hopkinson Bar (SHPB) testing were conducted. Finite element analysis (FEA) was employed to investigate the anisotropy of lattice structures under uniaxial compression, shear, and hydrostatic loading, providing further insight into the mechanisms behind the performance improvements of the hybrid lattice structure. By leveraging hybrid lattice structure to coordinate dynamic deformation, this work establishes a generalizable framework for designing high-performance, impact resistant materials for aerospace engineering, automobile design, and packaging.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"223 ","pages":"Article 114585"},"PeriodicalIF":6.6,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear vibration theory of variable cross-section piezoelectric films: design of noise reduction device 变截面压电薄膜的非线性振动理论：降噪装置的设计

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-23 DOI: 10.1016/j.tws.2026.114580

Jialin Zuo , Yukun Zhou , Peirong Zhong , Tianlin Jiang , Jinxin Xiao , Renhuai Liu , Wenhua Zhang

This study explores the design and nonlinear vibration behavior of piezoelectric layered structures with variable cross-section thickness. Using Hamilton's principle, we derive equations for the linear fundamental frequency, undamped free vibration, damped forced vibration, and voltage output, providing a theoretical basis for understanding the dynamic response. The impact of factors such as thickness variation, external load, damping coefficient, and radius on vibration and voltage output is analyzed through theoretical models. High-precision experiments validate the theoretical findings. The study also proposes a deep learning-based method to optimize the sound insulation performance of variable-thickness thin plates. This approach efficiently predicts the vibration characteristics and can improve design efficiency and performance for noise insulation. In conclusion, the research offers valuable theoretical and experimental insights into the nonlinear vibrations of piezoelectric plates with gradient thickness and supports their optimized design for sensor and energy harvesting applications.

研究了变截面厚度压电层状结构的设计及其非线性振动特性。利用Hamilton原理推导出了线性基频、无阻尼自由振动、阻尼受迫振动和电压输出的方程，为理解动态响应提供了理论基础。通过理论模型分析了厚度变化、外载荷、阻尼系数、半径等因素对振动和电压输出的影响。高精度实验验证了理论结果。提出了一种基于深度学习的变厚薄板隔声性能优化方法。该方法有效地预测了隔声结构的振动特性，提高了隔声结构的设计效率和性能。总之，该研究为梯度厚度压电板的非线性振动提供了有价值的理论和实验见解，并支持其用于传感器和能量收集应用的优化设计。

{"title":"Nonlinear vibration theory of variable cross-section piezoelectric films: design of noise reduction device","authors":"Jialin Zuo , Yukun Zhou , Peirong Zhong , Tianlin Jiang , Jinxin Xiao , Renhuai Liu , Wenhua Zhang","doi":"10.1016/j.tws.2026.114580","DOIUrl":"10.1016/j.tws.2026.114580","url":null,"abstract":"<div><div>This study explores the design and nonlinear vibration behavior of piezoelectric layered structures with variable cross-section thickness. Using Hamilton's principle, we derive equations for the linear fundamental frequency, undamped free vibration, damped forced vibration, and voltage output, providing a theoretical basis for understanding the dynamic response. The impact of factors such as thickness variation, external load, damping coefficient, and radius on vibration and voltage output is analyzed through theoretical models. High-precision experiments validate the theoretical findings. The study also proposes a deep learning-based method to optimize the sound insulation performance of variable-thickness thin plates. This approach efficiently predicts the vibration characteristics and can improve design efficiency and performance for noise insulation. In conclusion, the research offers valuable theoretical and experimental insights into the nonlinear vibrations of piezoelectric plates with gradient thickness and supports their optimized design for sensor and energy harvesting applications.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"223 ","pages":"Article 114580"},"PeriodicalIF":6.6,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel SBFEM-based semi-analytical solution for vibration analysis of fluid-filled functionally graded material shells resting on an elastic foundation 弹性地基上充液功能梯度材料壳振动分析的一种新型半解析解

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-23 DOI: 10.1016/j.tws.2026.114581

Wenbin Ye , Lei Gan , Jun Liu , Peiqing Wang , Yiqing Sun , Liang Chen , Lechen Li , Xinwei Song

In this paper, a novel semi-analytical approach based on the scaled boundary finite element method (SBFEM) is developed to investigate the free vibration of fluid-filled functionally graded material (FGM) shells resting on an elastic foundation. Building upon the conventional SBFEM, a unified modeling framework incorporating surface-based scaling techniques is established for the analysis of FGM shells. Unlike traditional SBFEM formulations that rely on scaling center mapping, the proposed method characterizes shell geometry solely through surface scaling transformations, thereby eliminating geometric discretization errors in theory and improving modeling accuracy. Furthermore, based on three-dimensional elasticity theory, the model discretizes only the shell surface using two-dimensional elements, which significantly reduces the number of degrees of freedom and computational cost while enhancing efficiency. Analytical solutions along the radial direction also contribute to improved accuracy and reliability of the results. The foundation support is simulated using a two-parameter Pasternak model, which restrains the motion of the overlying FGM shell through two independent physical mechanisms. The hydrodynamic pressure induced by the internal fluid is treated as an additional nodal variable in the governing equations of the fluid domain, modeled via the standard scaling-center-based SBFEM. The validity of the proposed method is verified through comparisons with existing reference solutions. Finally, a parametric study is conducted to examine the effects of key variables on the vibration frequency characteristics.

本文提出了一种基于尺度边界有限元法（SBFEM）的半解析方法来研究弹性地基上充液功能梯度材料（FGM）壳的自由振动问题。在传统SBFEM的基础上，建立了一个结合基于表面尺度技术的统一建模框架，用于FGM壳的分析。与传统的SBFEM公式依赖于标度中心映射不同，该方法仅通过表面标度变换来表征壳体几何形状，从而消除了理论上的几何离散化误差，提高了建模精度。此外，该模型基于三维弹性理论，仅采用二维单元对壳体表面进行离散，大大减少了自由度和计算成本，同时提高了计算效率。沿径向的解析解也有助于提高结果的准确性和可靠性。采用双参数帕斯捷尔纳克模型对基础支护进行了模拟，该模型通过两个独立的物理机制来抑制上覆FGM壳的运动。将内部流体引起的动水压力作为流体域控制方程中的附加节点变量，通过基于标度中心的标准SBFEM建模。通过与已有参考解的比较，验证了所提方法的有效性。最后，进行了参数化研究，考察了关键变量对振动频率特性的影响。

{"title":"A novel SBFEM-based semi-analytical solution for vibration analysis of fluid-filled functionally graded material shells resting on an elastic foundation","authors":"Wenbin Ye , Lei Gan , Jun Liu , Peiqing Wang , Yiqing Sun , Liang Chen , Lechen Li , Xinwei Song","doi":"10.1016/j.tws.2026.114581","DOIUrl":"10.1016/j.tws.2026.114581","url":null,"abstract":"<div><div>In this paper, a novel semi-analytical approach based on the scaled boundary finite element method (SBFEM) is developed to investigate the free vibration of fluid-filled functionally graded material (FGM) shells resting on an elastic foundation. Building upon the conventional SBFEM, a unified modeling framework incorporating surface-based scaling techniques is established for the analysis of FGM shells. Unlike traditional SBFEM formulations that rely on scaling center mapping, the proposed method characterizes shell geometry solely through surface scaling transformations, thereby eliminating geometric discretization errors in theory and improving modeling accuracy. Furthermore, based on three-dimensional elasticity theory, the model discretizes only the shell surface using two-dimensional elements, which significantly reduces the number of degrees of freedom and computational cost while enhancing efficiency. Analytical solutions along the radial direction also contribute to improved accuracy and reliability of the results. The foundation support is simulated using a two-parameter Pasternak model, which restrains the motion of the overlying FGM shell through two independent physical mechanisms. The hydrodynamic pressure induced by the internal fluid is treated as an additional nodal variable in the governing equations of the fluid domain, modeled via the standard scaling-center-based SBFEM. The validity of the proposed method is verified through comparisons with existing reference solutions. Finally, a parametric study is conducted to examine the effects of key variables on the vibration frequency characteristics.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114581"},"PeriodicalIF":6.6,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analytical study on the magneto-mechanical behaviors of hard-magnetic soft material shells based on a finite-strain shell model 基于有限应变壳模型的硬磁性软材料壳磁力学行为分析研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-23 DOI: 10.1016/j.tws.2026.114579

Zuodong Wang , Jiong Wang , Zhanfeng Li , Jianbin Wu , Weicheng Cai

In this paper, the magneto-mechanical behaviors of hard magnetic soft material (HMSM) shells are investigated through analytical approach. First, the total energy function for a HMSM shell sample is established. Through variational calculations, the 3D governing equations are derived, then the simplified governing equations are obtained by neglecting the self-activated magnetic field. Based on the simplified governing equations, a general finite-strain shell model for HMSM shells is developed through the series expansion and truncation method, which enables dimensional reduction while preserve key coupling effects. To validate this shell model, the bending and torsional deformation of a typical cylindrical shell structure are investigated. The analytical (asymptotic) solutions are derived and compared with the 3D Finite Element Method (FEM) simulation or experimental results, which show good consistency. Additionally, by conducting parametric studies, the influences of geometric parameters, material properties and magnetization vector on the magneto-mechanical behaviors of HMSM shells are revealed, which can provide critical insights into their coupled deformation mechanisms.

本文采用解析方法研究了硬磁软材料（HMSM）壳体的磁力学行为。首先，建立了HMSM壳体样品的总能量函数。通过变分计算，推导出三维控制方程，然后在忽略自激活磁场的情况下得到简化的控制方程。在简化控制方程的基础上，通过级数展开和截断法建立了HMSM壳的一般有限应变模型，在保持关键耦合效应的同时实现了降维。为验证该模型的有效性，对典型圆柱壳结构的弯曲和扭转变形进行了研究。推导了解析（渐近）解，并与三维有限元法（FEM）仿真或实验结果进行了比较，得到了较好的一致性。此外，通过参数化研究，揭示了几何参数、材料性能和磁化矢量对HMSM壳体磁力学行为的影响，为其耦合变形机制提供了重要的见解。

{"title":"Analytical study on the magneto-mechanical behaviors of hard-magnetic soft material shells based on a finite-strain shell model","authors":"Zuodong Wang , Jiong Wang , Zhanfeng Li , Jianbin Wu , Weicheng Cai","doi":"10.1016/j.tws.2026.114579","DOIUrl":"10.1016/j.tws.2026.114579","url":null,"abstract":"<div><div>In this paper, the magneto-mechanical behaviors of hard magnetic soft material (HMSM) shells are investigated through analytical approach. First, the total energy function for a HMSM shell sample is established. Through variational calculations, the 3D governing equations are derived, then the simplified governing equations are obtained by neglecting the self-activated magnetic field. Based on the simplified governing equations, a general finite-strain shell model for HMSM shells is developed through the series expansion and truncation method, which enables dimensional reduction while preserve key coupling effects. To validate this shell model, the bending and torsional deformation of a typical cylindrical shell structure are investigated. The analytical (asymptotic) solutions are derived and compared with the 3D Finite Element Method (FEM) simulation or experimental results, which show good consistency. Additionally, by conducting parametric studies, the influences of geometric parameters, material properties and magnetization vector on the magneto-mechanical behaviors of HMSM shells are revealed, which can provide critical insights into their coupled deformation mechanisms.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114579"},"PeriodicalIF":6.6,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A boundary determination and XIGA-based multiple crack type identification method for the rotating pre-twisted FG blade model 基于xiga的旋转预扭FG叶片多裂纹类型识别方法

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-22 DOI: 10.1016/j.tws.2026.114576

Saifeng Zhong , Guoyong Jin , Qingtao Gong , Yukun Chen , Na Wang

The identification of crack parameters in blades is crucial for the operational safety of rotating machinery. This paper presents a boundary determination and XIGA-based multiple crack type identification method for the rotating functionally graded (FG) blades. Assuming that the material varies in the thickness direction, the first-order shear deformation shell theory is used to describe the displacement of the FG blade with a pre-twisted angle. The XIGA method utilizing a level set approach is applied to consider the crack effects, with distinct enrichment functions capturing the displacement fields at the crack tip and along the crack faces. Taking the modal parameters as input, DE algorithm minimizes the objective function through multiple iterations to achieve intelligent quantitative identification of boundary penalty stiffness and crack parameters. Convergence and accuracy verifications of the cracked blade model with various types of cracks are performed by using data from experiments and software simulations. The parameter analysis reveals that different combinations of crack length and location induce distinct variation in the natural frequencies of the blade model. It is evident from the comparative analysis that the optimization technique with XIGA model exhibits comparable precision in detecting the targeted crack information. The developed method demonstrates applicability across multiple crack types, allowing for the effective identification of a wide range of crack parameter combinations.

叶片裂纹参数的识别对旋转机械的运行安全至关重要。提出了一种基于xiga的旋转功能梯度叶片多裂纹类型识别方法。假设材料沿厚度方向变化，采用一阶剪切变形壳理论来描述FG叶片带预扭角的位移。利用水平集方法的XIGA方法考虑裂纹效应，利用不同的富集函数捕获裂纹尖端和沿裂纹面的位移场。DE算法以模态参数为输入，通过多次迭代最小化目标函数，实现边界罚刚度和裂纹参数的智能定量化识别。利用实验数据和软件仿真对不同裂纹类型的叶片裂纹模型进行了收敛性和精度验证。参数分析表明，裂纹长度和位置的不同组合会引起叶片模型固有频率的显著变化。对比分析表明，采用XIGA模型的优化技术在检测目标裂纹信息方面具有相当的精度。所开发的方法证明了对多种裂纹类型的适用性，允许有效识别大范围的裂纹参数组合。

{"title":"A boundary determination and XIGA-based multiple crack type identification method for the rotating pre-twisted FG blade model","authors":"Saifeng Zhong , Guoyong Jin , Qingtao Gong , Yukun Chen , Na Wang","doi":"10.1016/j.tws.2026.114576","DOIUrl":"10.1016/j.tws.2026.114576","url":null,"abstract":"<div><div>The identification of crack parameters in blades is crucial for the operational safety of rotating machinery. This paper presents a boundary determination and XIGA-based multiple crack type identification method for the rotating functionally graded (FG) blades. Assuming that the material varies in the thickness direction, the first-order shear deformation shell theory is used to describe the displacement of the FG blade with a pre-twisted angle. The XIGA method utilizing a level set approach is applied to consider the crack effects, with distinct enrichment functions capturing the displacement fields at the crack tip and along the crack faces. Taking the modal parameters as input, DE algorithm minimizes the objective function through multiple iterations to achieve intelligent quantitative identification of boundary penalty stiffness and crack parameters. Convergence and accuracy verifications of the cracked blade model with various types of cracks are performed by using data from experiments and software simulations. The parameter analysis reveals that different combinations of crack length and location induce distinct variation in the natural frequencies of the blade model. It is evident from the comparative analysis that the optimization technique with XIGA model exhibits comparable precision in detecting the targeted crack information. The developed method demonstrates applicability across multiple crack types, allowing for the effective identification of a wide range of crack parameter combinations.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114576"},"PeriodicalIF":6.6,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental evaluation on the shear performance of grouted bolt connections in steel-CLT and steel-CLBT composite structures 钢- clt和钢- clbt组合结构注浆螺栓连接抗剪性能试验评价

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-22 DOI: 10.1016/j.tws.2026.114573

Jinwei Lu , Yang Wei , Hao Du , Kang Zhao , Silu Huang , Jiawei Chen

Steel-cross laminated timber (CLT) composite floors have increasingly emerged as an alternative to steel-concrete composite floors due to their sustainability and construction efficiency. In addition, given the superior mechanical properties and resource utilization of cross-laminated bamboo and timber (CLBT), steel-CLBT composite systems hold promise for further enhancing the overall structural performance of steel-timber composite (STC) floors. The composite action of STC systems is governed by the shear performance of their connections. Traditional demountable bolt connections exhibit low stiffness in STC systems. Therefore, this study proposed grouted bolt connections for steel-CLT and steel-CLBT composite structures. Ten sets of push-out specimens were designed to investigate the effects of bolt diameter, bolt strength, grout diameter, and panel type. The test results indicate that steel-CLBT connections failed due to bolt shear, whereas those in the steel-CLT connections exhibited failure modes involving grout crushing, timber crushing, and bolt bending. The grouted bolted connections in the steel-CLBT composite system exhibit significantly higher shear capacity and slip stiffness than those in the steel-CLT composite system (shear capacity increased by 45–70% and slip stiffness increased by 1.8–10 times), albeit with lower ductility. In addition, compared with demountable bolted connections, the grouted bolted connections in the steel-CLBT composite system achieve more than a twofold increase in slip stiffness. Finally, based on the different failure modes, the shear capacity and load-slip behavior of various connections were evaluated and predicted.

由于其可持续性和施工效率，钢-交叉层压木材（CLT）复合地板越来越多地成为钢-混凝土复合地板的替代品。此外，考虑到竹木交叉层压（CLBT）优越的力学性能和资源利用率，钢-CLBT复合系统有望进一步提高钢-木复合地板（STC）的整体结构性能。STC体系的复合作用取决于其连接的抗剪性能。传统的可拆卸螺栓连接在STC系统中具有较低的刚度。因此，本研究提出了钢- clt和钢- clbt组合结构的注浆螺栓连接。设计了10组推拔试件，研究了锚杆直径、锚杆强度、注浆直径和面板类型对锚杆承载力的影响。试验结果表明，钢- clt连接的破坏主要是由于锚杆剪切，而钢- clt连接的破坏模式主要是注浆破碎、木材破碎和锚杆弯曲。与钢- clt组合体系相比，钢- clt组合体系中注浆螺栓连接的抗剪承载力和滑移刚度显著提高（抗剪承载力提高45 ~ 70%，滑移刚度提高1.8 ~ 10倍），但延性较低。此外，与可拆卸螺栓连接相比，在钢- clbt复合体系中，注浆螺栓连接的滑移刚度提高了两倍以上。最后，根据不同的破坏模式，对不同连接的抗剪能力和荷载-滑移行为进行了评估和预测。

{"title":"Experimental evaluation on the shear performance of grouted bolt connections in steel-CLT and steel-CLBT composite structures","authors":"Jinwei Lu , Yang Wei , Hao Du , Kang Zhao , Silu Huang , Jiawei Chen","doi":"10.1016/j.tws.2026.114573","DOIUrl":"10.1016/j.tws.2026.114573","url":null,"abstract":"<div><div>Steel-cross laminated timber (CLT) composite floors have increasingly emerged as an alternative to steel-concrete composite floors due to their sustainability and construction efficiency. In addition, given the superior mechanical properties and resource utilization of cross-laminated bamboo and timber (CLBT), steel-CLBT composite systems hold promise for further enhancing the overall structural performance of steel-timber composite (STC) floors. The composite action of STC systems is governed by the shear performance of their connections. Traditional demountable bolt connections exhibit low stiffness in STC systems. Therefore, this study proposed grouted bolt connections for steel-CLT and steel-CLBT composite structures. Ten sets of push-out specimens were designed to investigate the effects of bolt diameter, bolt strength, grout diameter, and panel type. The test results indicate that steel-CLBT connections failed due to bolt shear, whereas those in the steel-CLT connections exhibited failure modes involving grout crushing, timber crushing, and bolt bending. The grouted bolted connections in the steel-CLBT composite system exhibit significantly higher shear capacity and slip stiffness than those in the steel-CLT composite system (shear capacity increased by 45–70% and slip stiffness increased by 1.8–10 times), albeit with lower ductility. In addition, compared with demountable bolted connections, the grouted bolted connections in the steel-CLBT composite system achieve more than a twofold increase in slip stiffness. Finally, based on the different failure modes, the shear capacity and load-slip behavior of various connections were evaluated and predicted.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114573"},"PeriodicalIF":6.6,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0